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DS18S20-PAR
DETAILED PIN DESCRIPTIONS Table 1
PIN
1
2
3
SYMBOL
GND
DQ
NC
DESCRIPTION
Ground.
Data Input/Output pin. Open-drain 1-Wire interface pin. Also provides power
to the device when used in parasite power mode (see “Parasite Power” section.)
No Connect. Doesn’t connect to internal circuit.
OVERVIEW
The DS18S20-PAR uses Dallas’ exclusive 1-Wire bus protocol that implements bus communication
using one control signal. The control line requires a weak pullup resistor since all devices are linked to
the bus via a 3-state or open-drain port (the DQ pin in the case of the DS18S20-PAR). In this bus system,
the microprocessor (the master device) identifies and addresses devices on the bus using each device’s
unique 64-bit code. Because each device has a unique code, the number of devices that can be addressed
on one bus is virtually unlimited. The 1-Wire bus protocol, including detailed explanations of the
commands and “time slots,” is covered in the 1-WIRE BUS SYSTEM section of this datasheet.
An important feature of the DS18S20-PAR is its ability to operate without an external power supply.
Power is instead supplied through the 1-Wire pullup resistor via the DQ pin when the bus is high. The
high bus signal also charges an internal capacitor (C PP ), which then supplies power to the device when the
bus is low. This method of deriving power from the 1-Wire bus is referred to as “parasite power.”
Figure 1 shows a block diagram of the DS18S20-PAR, and pin descriptions are given in Table 1. The
64-bit ROM stores the device’s unique serial code. The scratchpad memory contains the 2-byte
temperature register that stores the digital output from the temperature sensor. In addition, the scratchpad
provides access to the 1-byte upper and lower alarm trigger registers (T H and T L ). The T H and T L
registers are nonvolatile (EEPROM), so they will retain their data when the device is powered down.
DS18S20-PAR BLOCK DIAGRAM Figure 1
V PU
4.7K
PARASITE POWER
CIRCUIT
MEMORY CONTROL
LOGIC
DS18S20-PAR
DQ
TEMPERATURE SENSOR
INTERNAL V DD
64-BIT ROM
AND
GND
C PP
1-wire PORT
SCRATCHPAD
ALARM HIGH TRIGGER (T H )
REGISTER (EEPROM)
ALARM LOW TRIGGER (T L )
REGISTER (EEPROM)
8-BIT CRC GENERATOR
2 of 20
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DS18S20-SL+T&R 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 1-WIRE - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN HI-PREC TO-92 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr
DS18S20-SL+T&R 功能描述:板上安装温度传感器 Prgmble Resolution 1-Wire Parasite Pwr RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
DS18S20-W 制造商:Maxim Integrated Products 功能描述:
DS18S20Z 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
DS18S20Z/T&R 制造商:Maxim Integrated Products 功能描述:HI PREC MICROLAN DIG THERM 8-SO T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN HI-PREC 8-SOIC
DS18S20Z/T&R 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
DS18S20Z+ 功能描述:板上安装温度传感器 Prgmble Resolution 1-Wire Parasite Pwr RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor